// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_VIEWS_CONTROLS_SCROLLBAR_NATIVE_SCROLL_BAR_H_
#define UI_VIEWS_CONTROLS_SCROLLBAR_NATIVE_SCROLL_BAR_H_

#include <string>

#include "base/compiler_specific.h"
#include "base/gtest_prod_util.h"
#include "base/macros.h"
#include "ui/views/controls/scrollbar/scroll_bar.h"
#include "ui/views/view.h"

namespace ui {
class NativeTheme;
}

namespace views {

class NativeScrollBarWrapper;

// The NativeScrollBar class is a scrollbar that uses platform's
// native control.
class VIEWS_EXPORT NativeScrollBar : public ScrollBar {
public:
    // The scroll-bar's class name.
    static const char kViewClassName[];

    // Create new scrollbar, either horizontal or vertical.
    explicit NativeScrollBar(bool is_horiz);
    ~NativeScrollBar() override;

    // Return the system sizes.
    static int GetHorizontalScrollBarHeight(const ui::NativeTheme* theme);
    static int GetVerticalScrollBarWidth(const ui::NativeTheme* theme);

private:
    friend class NativeScrollBarTest;
    FRIEND_TEST_ALL_PREFIXES(NativeScrollBarTest, Scrolling);

    // Overridden from View.
    gfx::Size GetPreferredSize() const override;
    void Layout() override;
    void ViewHierarchyChanged(
        const ViewHierarchyChangedDetails& details) override;
    const char* GetClassName() const override;

    // Overrideen from View for keyboard UI purpose.
    bool OnKeyPressed(const ui::KeyEvent& event) override;
    bool OnMouseWheel(const ui::MouseWheelEvent& e) override;

    // Overridden from ui::EventHandler.
    void OnGestureEvent(ui::GestureEvent* event) override;

    // Overridden from ScrollBar.
    void Update(int viewport_size, int content_size, int current_pos) override;
    int GetPosition() const override;
    int GetLayoutSize() const override;

    // init border
    NativeScrollBarWrapper* native_wrapper_;

    DISALLOW_COPY_AND_ASSIGN(NativeScrollBar);
};

} // namespace views

#endif // UI_VIEWS_CONTROLS_SCROLLBAR_NATIVE_SCROLL_BAR_H_
